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Take off the cover, remove the battery and use a pencil eraser to clean both the battery plug pads and the plugs in the phone. Get a piece of thin tape and apply to the bottom of the battery and then reinsert. Try to power up. Sometimes dropping it will slightly bend the batter contacts or misalign them. Clean and see if that helps.
Sounds like you may have a dodgy power button, you have a 1 year warranty I would call or e-mail sum vision, I have one of these systems and there not bad I've not had a power button problem though. Hope this helps!
try taking out all peripherals like mouse printer keyboard leave screen pluggged n then press and hold the power button for 2 minutes then plug in your mouse and keyboard and see if it boots hope this helps
TEST POWER LEADS TO STARTER FOR POWER
AT STARTER (BATTERY POSITIVE TO STARTER BATTERY NEGATIVE TO ENGINE BLOCK)
THEN TEST FOR SIGNAL POWER TO SELENOIDE ON STARTER
(KEY TURNED TO START POWER SHOULD GO TO SELENOIDE)
IF NO POWER TO SIGNAL WIRE CHECK FUSES AND RELAYS
ON STARTER CIRCUIT
IF THIS CHECKS OUT MAY BE AUTO TRANSMISSION NUTRAL PARK SWITCH
TRY TO START IN NUTRAL OR WHILE SHIFTING TRUE GEARS SLOWLY WITH SHIFTER
IF STANDARED CHECK NUTRAL SAFETY SWITCH
When you power up first let it going into off chargeing mode, then hold the power button to turn it on, continue to hold it through this whole process, then after the sitck together box has been completed (which may take a few attempets) rapidly push the right soft key until your phone jump in and out of the t-zones area which should be your default right soft key buttong then you should be able to use your phobe normally, note that it did take me a good half an hour of doing this to make my phone through the whole process. :)